<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.sql.PreparedStatement" %><%--
  Created by IntelliJ IDEA.
  User: cc
  Date: 2020/10/21
  Time: 8:07
  To change this template use File | Settings | File Templates.
--%><%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
            //加载数据库驱动
            Class.forName("com.mysql.jdbc.Driver");

            //建立数据库连接
            String url = "jdbc:mysql://localhost:3306/book";//数据库连接地址
        Connection connection= DriverManager.getConnection(url,"root","root");
//第一个root为数据库的用户名 第二个root为数据库的密码

            String sql = "delete from user where id=?";
            //在PreparedStatement 中使用问好代替实际参数
            PreparedStatement ps = connection.prepareStatement(sql);

            int id=Integer.parseInt(request.getParameter("id"));

            ps.setInt(1,id);

            int count=ps.executeUpdate();

            if(count>0){
                out.print("删除成功");
            }else {
                out.print("删除失败");
            }
        %>